Petrogenesis of mafic alkaline dikes from the ~2.18Ga Mahbubnagar Large Igneous Province, Eastern Dharwar Craton, India: Geochemical evidence for uncontaminated intracontinental mantle derived magmatism

Lithos ◽  
2013 ◽  
Vol 179 ◽  
pp. 84-98 ◽  
Author(s):  
Tarun C. Khanna ◽  
V.V. Sesha Sai ◽  
G.C. Zhao ◽  
D.V. Subba Rao ◽  
A. Keshav Krishna ◽  
...  
Keyword(s):  
Dharwar Craton ◽  
Large Igneous Province ◽  
Eastern Dharwar Craton ◽  
Geochemical Evidence ◽  
Igneous Province

scholarly journals Petrography and Geochemistry (Trace, Ree and Pge) of Pedda Cherlo Palle Gabbro-Diorite Pluton, Prakasam Igneous Province, Andhra Pradesh, India

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
K.S.V. Subramanyam ◽  
U.V.B. Reddy ◽  
V. Balaram ◽  
Parijat Roy
Keyword(s):  
Andhra Pradesh ◽  
Dharwar Craton ◽  
Mobile Belt ◽  
Junction Zone ◽  
Eastern Dharwar Craton ◽  
Eastern Ghat ◽  
Igneous Province ◽  
Eastern Ghat Mobile Belt

AbstractPrakasam Igneous Province (PIP) is an important geological domain in the Eastern Dharwar Craton (EDC), found in the junction zone between the EDC and Eastern Ghat Mobile Belt (EGMB). The Pedda Cherlo Palle (PCP) gabbros are massive, leucocratic-mesocractic, and show cumulus textures with minerals plagioclase, cpx, and amphiboles. Compositionally, plagioclase is a labradorite-bytownite, cpx is diopside to augite, olivines are hyalosiderites and amphiboles are magnesiohornblendes. PCP gabbros have normal SiO

Geochemical characterization and geodynamic implication of N-trending mafic dyke swarm from the western Dharwar craton and their possible link to the ca. 2.22 Ga large igneous province

2020 ◽  
Vol 196 (3) ◽  
pp. 243-260
Author(s):  
Apratim K. Rai ◽  
Rajesh K. Srivastava ◽  
Amiya K. Samal ◽  
V.V. Sesha Sai
Keyword(s):  
Trace Elements ◽  
Potential Temperature ◽  
Chemical Characterization ◽  
Dharwar Craton ◽  
Large Igneous Province ◽  
Lower Percentage ◽  
Dyke Swarm ◽  
Minor Role ◽  
Mafic Dykes ◽  
Igneous Province

Several N-trending mafic dykes are exposed in the western Dharwar craton (WDC) and they are thought to be coeval with the ca. 2.22 Ga N- to NNW-trending Kandlamadugu dyke swarm of the eastern Dharwar craton (EDC). Geo- chemical characterization of these dykes is presented here to understand their genetic aspects and likely correlation with their counterpart in the EDC. Petrographic examinations suggest mineralogical and textural variations from dolerite to metadolerite types. Geochemically they are classified either as sub-alkaline tholeiitic basalt or basaltic andesite. Geochemical variations suggest evolution of mantle melt and demonstrate prominent clinopyroxene fractionation, however, minor role of olivine, orthopyroxene and plagioclase fractionation cannot be discarded at initial stages of crystallization. Fractionation trends of trace elements suggest crystallization of accessory phases like ilmenite, apatite and zircon, at later stages. Although observed geochemical nature suggests a little effect of involvement of crust, however, its role in the genesis of the studied mafic dykes cannot be ignored. Conversely, it is suggested that they are derived from a melt generated in a sub-continental lithospheric mantle (SCLM), which was metasomatized during an ancient subduction event before its cratonization. Based on the petrogenetic models of incompatible trace elements, it is inferred that they were likely to be derived from a melt generated by a lower percentage of melting within the garnet or garnet-spinel transition zone. Their connection to the ca. 2.22 Ga large igneous province (LIP) indicates as an integral part of the ca. 2.22 Ga N- to NNW-trending Kandlamadugu dyke swarm of the EDC. The existence of a mantle plume, substantiated by mantle potential temperature (Tp) estimate, is well-supported by higher thermal regime in the upper mantle. Although there is no direct age data available for the studied mafic dykes, however, their geochemical similarities with the ca. 2.22 Ga Kandlamadugu swarm suggest that they are co-genetic and could be linked to the same event. The likely age correlation of the ca. 2.22 Ga Kandlamadugu swarm with mafic dykes of North Atlantic and Superior cratons, support their link with the Superia supercraton.

Paleoproterozoic metaluminous syenites synchronous with the c. 2.21 Ga mafic dyke swarms from the Eastern Dharwar Craton, India: implications for alkaline magmatism associated with the breakup of supercraton Superia

2021 ◽  
pp. SP513-2020-92
Author(s):  
Ashutosh Pandey ◽  
N. V. Chalapathi Rao ◽  
Waliur Rahaman ◽  
Vikas Seth ◽  
Samarendra Sahoo
Keyword(s):  
Partial Melting ◽  
Dharwar Craton ◽  
Large Igneous Province ◽  
Dyke Swarm ◽  
Alkaline Magmatism ◽  
Cuddapah Basin ◽  
Eastern Dharwar Craton ◽  
Mafic Dyke ◽  
Crustal Source ◽  
Supplementary Material

AbstractThe Eastern Dharwar Craton (EDC) hosts numerous Late Neoarchean to Paleoproterozoic syenites whose genesis remains unclear. Here, we present a petrological and geochemical study on the syenites from Peddavaduguru, Danduvaripalle and Vannedoddi, towards the western margin of the Paleo-Mesoproterozoic Cuddapah Basin in the EDC. These syenite bodies constitute a part of the Paleoproterozoic (2210±110 Ma) Dancherla alkaline complex and are contemporaneous with a mafic dyke swarm emplacement in the EDC. The Danduvaripalle and Vannedoddi syenites display geochemical affinities to adakites. The Peddavaduguru syenite shows a negative Eu anomaly and relatively gentle chondrite-normalized REE pattern, suggesting an origin by a different process. The initial ɛNd values range between 0.5 and 0.8 for the Peddavaduguru syenite, −5.2 and −4.2 for the Danduvaripalle syenite, and −6.0 and −1.0 for the Vannedoddi syenite. In tectonic discrimination diagrams, the Peddavaduguru syenite shows affinities to within-plate granitoids similar to syenites from the Deccan large igneous province whereas the others show geochemical similarities to arc-related alkaline rocks and volcanic arc granitoids. The adakitic syenites show deficiency of MgO, Ni, Cr and Sc, highly fractionated REE patterns and negative Nb-Ta-Ti anomalies along with low Nb/U and high Th/U ratios. These geochemical traits are compatible with their origin by the partial melting of a mafic crustal source that subsequently underwent fractionation of amphibole and garnet responsible to impart an adakitic character. We suggest that the crustal source of these syenites underwent partial melting by heat from the rising plume during the Paleoproterozoic extension of the Superia supercraton. The non-adakitic Peddavaduguru syenite, on the other hand, is suggested to have originated from direct fractionation of mafic magma.Supplementary material at https://doi.org/10.6084/m9.figshare.c.5276675

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